/**
 * 访问test数据库
 */

const mysql = require('mysql');

const pool  = mysql.createPool({
    connectionLimit : 10,
    host            : "127.0.0.1",
    user            : "test",
    password        : "123456",
    database        : "test"
  });

/**
 * 获取SQL执行结果
 * @returns {Promise}
 */
function query(sql, values){
    return new Promise((resolve, reject)=>{
        //连接池中获取连接
        pool.getConnection((error, connection)=>{
            if(error){
                reject(error);
            }else{
                //执行SQL语句
                connection.query(sql, values, (error, results) => {
                    //释放连接
                    connection.release();
                    if(error){
                        reject(error);
                    }else{
                        resolve(results);
                    }
                });
            }
        });
    });
}

module.exports = { query };